<template>
  <div class="star" :class="`star-${size}`">
    <span class="star-item" v-for="(sc,index) in starClasses" :key="index" :class="sc"></span>
</div>
</template>

<script>
const CLASS_ON = 'on'
const CLASS_HALF = 'half'
const CLASS_OFF = 'off'
export default {
props:{
    score:Number,
    size:Number
},
computed:{
    starClasses(){
        const {score} = this
        const scs = []
        // 向scs中添加n个CLASS_ON
        const scoreInteger = Math.floor(score)
        for(let i = 0;i<scoreInteger;i++){
            scs.push(CLASS_ON)
        }
        // 向scs中添加0/1个CLASS_HALF
        if(score*10 - scoreInteger*10>=5){
            scs.push(CLASS_HALF)
        }
        // 向scs中添加n个CLASS_OFF
        while (scs.length<5) {
            scs.push(CLASS_OFF)
        }
        return scs
    }
}
}
</script>

<style lang="stylus" rel="stylesheet/stylus">
@import "../../common/stylus/mixins.styl";
     .star //2x图 3x图
                            float left
                            font-size 0
                            .star-item
                              display inline-block
                              background-repeat no-repeat
                            &.star-48
                              .star-item
                                width 20px
                                height 20px
                                margin-right 22px
                                background-size 20px 20px
                                &:last-child
                                  margin-right: 0
                                &.on
                                  bg-image('./images/star48_on')
                                &.half
                                  bg-image('./images/star48_half')
                                &.off
                                  bg-image('./images/star48_off')
                            &.star-36
                              .star-item
                                width 15px
                                height 15px
                                margin-right 6px
                                background-size 15px 15px
                                &:last-child
                                  margin-right 0
                                &.on
                                  bg-image('./images/star36_on')
                                &.half
                                  bg-image('./images/star36_half')
                                &.off
                                  bg-image('./images/star36_off')
                            &.star-24
                              .star-item
                                width 10px
                                height 10px
                                margin-right 3px
                                background-size 10px 10px
                                &:last-child
                                  margin-right 0
                                &.on
                                  bg-image('./images/star24_on')
                                &.half
                                  bg-image('./images/star24_half')
                                &.off
                                  bg-image('./images/star24_off')
</style>